Question

Out of 300 pages of a book,2/5 are read on one day and 3/10 on the other day.Find how many pages of the book are left unread

Answer 1

293/5 pages ......
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if...helpful... plz.....mark...as..brain list...

Answer 2

Total number of pages = 300
Fraction of pages read on the first day = $\frac{2}{5}$
∴ Number of pages read on the first day = $\frac{2}{5} of 300 = \frac{2}{5} * 300 = \frac{600}{5} = 120$
Fraction of pages read on the second day = $\frac{3}{10}$
∴ Number of pages read on the second day = $\frac{3}{10} of 300 = \frac{3}{10} * 300 = 3 * 30 = 90$
Let the number of pages that are left unread be x. 
Now, 
120 + 30 + x = 300
210 + x = 300
x = 300 - 210 = 90
x = 90
∴ 90 pages of the book are left unread. 

Hope this may help you.